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Interesting this. Same is true on Windows. At first I thought it could be merging, but I see that Padders included an ORDER BY, presumably for this very reason ( i.e. force no merge ).

The only difference in 10g with this that I can see is the FAST DUAL optimisation. I can't see anything else in trace. It could be a bug of course. It doesn't appear to be anything to do with the PLSQL_OPTIMIZE_LEVEL either - setting this to 0 made no difference.

Sorry, didn't see this before posting the thing about the context suffering the same fate.

Right, this is my last post on this one. Including a column in the outer projection seems to help. Without it, there is no projection at all. I still think this is a bug as I can't see what difference this could make as the plans are the same.